* kubectl: This client version requires the `apps/v1` APIs, so it will not work against a cluster version older than v1.9.0. Note that kubectl only guarantees compatibility with clusters that are +/-1 minor version away. ([#61419](https://github.com/kubernetes/kubernetes/pull/61419), [@enisoc](https://github.com/enisoc))

- [`KT-55879`](https://youtrack.jetbrains.com/issue/KT-55879) Modularized tests: fir.bench.language.version is used as API version, not language version
- [`KT-51821`](https://youtrack.jetbrains.com/issue/KT-51821) ClassCastException on anonymous fun interface implementation when unrelated vararg is used

- CRD supports multi-version Schema, Subresources and AdditionalPrintColumns (NOTE that CRDs created prior to 1.13 populated the top-level additionalPrinterColumns field by default. To apply an updated that changes to per-version additionalPrinterColumns, the top-level additionalPrinterColumns field must be explicitly set to null). ([#70211](https://github.com/kubernetes/k...

pkg syscall (darwin-arm64), const IPV6_V6ONLY = 27
pkg syscall (darwin-arm64), const IPV6_VERSION = 96
pkg syscall (darwin-arm64), const IPV6_VERSION ideal-int
pkg syscall (darwin-arm64), const IPV6_VERSION_MASK = 240
pkg syscall (darwin-arm64), const IPV6_VERSION_MASK ideal-int
pkg syscall (darwin-arm64), const IP_ADD_MEMBERSHIP = 12
pkg syscall (darwin-arm64), const IP_ADD_SOURCE_MEMBERSHIP = 70

- `kubectl api-resources` now prints the API version (as 'API group/version', same as output of `kubectl api-versions`). The column APIGROUP is now APIVERSION ([#95253](https://github.com/kubernetes/kubernetes/pull/95253), [@sallyom](https://github.com/sallyom)) [SIG CLI]

- The go version defined in `.go-version` is now fetched when invoking test, build, and code generation targets if the current go version does not match it. Set $FORCE_HOST_GO=y while testing or building to skip this behavior, or set $GO_VERSION to override the selected go version. ([#115498](https://github.com/kubernetes/kubernetes/pull/115498), [@liggitt](https://github.com/liggitt)) [SIG Release...

* Adds a metric apiserver_request_error_total to kube-apiserver. This metric tallies the number of request_errors encountered by verb, group, version, resource, subresource, scope, component, and code.  ([#83427](https://github.com/kubernetes/kubernetes/pull/83427), [@logicalhan](https://github.com/logicalhan))

For stable features, the `kubectl` tool follows the Kubernetes [version skew policy](https://kubernetes.io/releases/version-skew-policy/);
however, kubectl v1.21 and older do not support the new API for ephemeral containers.

pkg syscall (netbsd-arm64-cgo), const IPV6_V6ONLY = 27
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION = 96
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION ideal-int
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION_MASK = 240
pkg syscall (netbsd-arm64-cgo), const IPV6_VERSION_MASK ideal-int
pkg syscall (netbsd-arm64-cgo), const ISIG = 128
pkg syscall (netbsd-arm64-cgo), const ISIG ideal-int

- Kube-apiserver: The `rbac.authorization.k8s.io/v1alpha1` API version is removed; use the `rbac.authorization.k8s.io/v1` API, available since v1.8. The `scheduling.k8s.io/v1alpha1` API version is removed; use the `scheduling.k8s.io/v1` API, available since v1.14. ([#104248](https://github.com/kubernetes/kubernetes/pull/104248), [@liggitt](https://github.com/liggitt))